Indian scholars  Brij Nandan Tripathi, Anil Kumar Agrawal, Dipankar Ray and Somnath Chattopadhyaya from Indian Institute of Technology publish a paper

You can download paper freely. You don't pay money. It is Open Access Creative Commons license.

Expert system to select tunnel boring machine (TBM)

https://iopscience.iop.org/article/10.1088/1757-899X/691/1/012012